Malicious PDF — malware analysis report

Static analysis result for SHA-256 995c7e40382aa461…

MALICIOUS

PDF

80.0 KB Created: 2021-09-17 15:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d715e9f99f6a107436be6171f966ac29 SHA-1: 82ab0c428927c37e1162971e5917376b16f1b3e0 SHA-256: 995c7e40382aa46180274d7969a9723ce46899b116464713140bdb3bba143c45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains, suggesting a link farm designed to redirect users. The presence of 'utm_term' in one URL indicates a potential phishing or advertising lure. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nomylo.ru/uplcv?utm_term=adguard+premium+apk+cracked PDF link annotation
    • http://glamour-nsk.ru/ckfinder/userfiles/files/keperurowapuvagasuw.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/26600625509.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376a497685f---25557045169.pdfIn PDF document text
    • http://eternaseguros.net/files/files/75963299312.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/41552040245.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/nulagitidujufadavesuvogiv.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161304dcbf0efc---punub.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/80677297090.pdfIn PDF document text
    • https://adikmanis.com/contents/files/32241685599.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/290a36e554c6d4ccd529814e3a1c9e94/89386783547.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/rerolofapiwitof.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/jagivigewatew.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/xukelanerijezobod.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/613cb3dddc705.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/42671215711.pdfIn PDF document text
    • http://asfalon.com/__files/file/99050766075.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/boperuzelelid.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/zobimu.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/bevarupesejarebulekif.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/nirowudadimakakeb.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/4079513733.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16143d7482f3df---84994913008.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/mafuluseri.pdfIn PDF document text
    • http://maksimetall.ru/files/3059822194.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/wavodobuguvepatuba.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DC 17708 bytes
SHA-256: fe44e96c6e448f44b0337186eceb25443b48db9a2d3a5da4604a5cc6774253aa
font_01_sfnt_off00010284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10284 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9B 10496 bytes
SHA-256: 26ffb03a8be4cf5c71b40f2733c06b7b8baeef9966d97699228f831ae1a6a62b

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